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As it says in the title: this is a blurry rainbow brush for Clip Studio Paint. Feel free to use.
Play around with opacity and blending modes to get different effects.
You can download it here (.SUT file):
Note: If the download doesn’t start, right click on the download button and choose “Save link as…”.
Some examples of where I’ve used this brush
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(Click on the image to read the full comic)
In this last panel I used the rainbow brush as a base for all the different pride flag colors. I simply locked the opacity of the layer and then used a soft airbrush to recolor them in different pride flag colors.
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Here I’ve used the Fingertip Smudge tool to make the rainbow look like a lens flare effect.